user-defined-literal:
user-defined-integer-literal
user-defined-floating-literal
user-defined-string-literal
user-defined-character-literal
user-defined-integer-literal:
decimal-literal ud-suffix
octal-literal ud-suffix
hexadecimal-literal ud-suffix
binary-literal ud-suffix
user-defined-floating-literal:
fractional-constant exponent-partopt ud-suffix
digit-sequence exponent-part ud-suffix
user-defined-string-literal:
string-literal ud-suffix
user-defined-character-literal:
character-literal ud-suffix
ud-suffix:
identifier
If L is a user-defined-integer-literal, let n be the literal without its ud-suffix. If S contains a literal operator with parameter type unsigned long long, the literal L is treated as a call of the form
operator "" X(nULL)
Otherwise, S shall contain a raw literal operator or a literal operator template ([over.literal]) but not both. If S contains a raw literal operator, the literal L is treated as a call of the form
operator "" X("n")
Otherwise (S contains a literal operator template), L is treated as a call of the form
operator "" X<'c1', 'c2', ... 'ck'>()
where n is the source character sequence c1c2...ck. [ Note: The sequence c1c2...ck can only contain characters from the basic source character set. — end note ]
If L is a user-defined-floating-literal, let f be the literal without its ud-suffix. If S contains a literal operator with parameter type long double, the literal L is treated as a call of the form
operator "" X(fL)
Otherwise, S shall contain a raw literal operator or a literal operator template ([over.literal]) but not both. If S contains a raw literal operator, the literal L is treated as a call of the form
operator "" X("f")
Otherwise (S contains a literal operator template), L is treated as a call of the form
operator "" X<'c1', 'c2', ... 'ck'>()
where f is the source character sequence c1c2...ck. [ Note: The sequence c1c2...ck can only contain characters from the basic source character set. — end note ]
If L is a user-defined-string-literal, let str be the literal without its ud-suffix and let len be the number of code units in str (i.e., its length excluding the terminating null character). The literal L is treated as a call of the form
operator "" X(str, len)
[ Example:
long double operator "" _w(long double);
std::string operator "" _w(const char16_t*, std::size_t);
unsigned operator "" _w(const char*);
int main() {
1.2_w; u"one"_w; 12_w; "two"_w; }
— end example ]
[ Example:
int main() {
L"A" "B" "C"_x; "P"_x "Q" "R"_y;}
— end example ]
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